William



(No'MddeL) WVG; BARNEY.

TELEPHONE RECEIVER.

Patented Feb. 8, 1887.

, TED TATES WILLIAM o. BARNEY, OF NEW YORK, N. Y., ASSIGNOR TO JOSIAH o.nnmr, l d or SAME PLACE.

TELEPHONE-RECEIVER.

EBPECIPICATION forming part of Letters Patent No. 357,360, datedFebruary 8, 1887.

Application filed January 18, 1886. serial No. 188,814. (No model.)

, To all whom, it may concern: by a ring supported byseveral projectionsBe it known that 1, WILLIAM CHASE BAR- from the ring. The holder towhich the ar- NEY, of the city and State of New York, have mature isattached may be a straight piece, or invented an Improvement inTelephone-Re may have the form ofa cross having three or i; 5 ceivers,of which the following is a speciiicafour arms. The ends of the arms ofthe cross 2 tiOnmay be curved, so that they will form, as it Thisinvention relates to telephonereceivwere, legs to support the armature,their ends ers known as electromagnetic receivers. to rest loosely incavities made in the ring at- I In order to avoid the sounds which aretached to the case of the magnet. i re emitted by a plate of iron whensecured around In order to put the tympan out of condition its edge andsubmitted to the action of amagto produce its particular scale ofharmonic net, I use for an armature a short thick piece sounds, I pierceit with holes irregularly of iron. This mass is secured to a very lightplaced and outside the portion thereof lying elastic support, in orderthat the support may over the coreof the magnet, thus leaving it to ;I5offer very little resistance to the attraction of reproduce the wordsofthe speaker without the magnet. I use for a tympan orsoundihgalteration in quality or tone or in any=other board a thin sheetof wood, cardboard, cellurespect. loid, glass, horn, ivory, bone, cork,mica, vul- In the drawings, Figure 1 is a longitudinal l oanite, brass,or equivalent material. I find section of the telephonic receiver. Fig.2 is a 7c 120 that when the tympan is inclosed in a case or separateelevation and side view of the armasounding-box the vibrations of thetympan ture and support. Fig. 3 is a detached edge produced by thevarying attractive force of View and side view section of thebirdseyethe magnet are injuriously affected. I find, maple tympan withholes in it. Fig. 4 is an also, that the passage of air-waves through 2.end view of the instrument. Fig. 5 is an edge 25 tube are more or lessinjuriously affected by view, and Fig. 6 is a side view, of the armathevibrations of the sides of the tube. There ture-support in the form of across. fore my tympan is secured at its edge to a Arepresents the coreof the magnet, which rigid support attached to the magnet, and therecore may be permanently magnetized, and B is no substance whateverbetween the vibratory denotes the helix or coils of the same.

0 part of the tympan and the ear of thelistener. In order to intensifythe action of one end of Sometimes a permanent magnet having a coil themagnet, the mass of soft iron 0 is attached surrounding it from end toend may be used, to the other pole thereof. Opposite the other 1 and inorder to increase the magnetic force of pole thereof is the armature D,in the form of 1 the pole of the magnet in front of the armaa shortthick piece of iron, as aforesaid, that 13 5 *ture I place a mass ofsoft iron against the is fastened to the elastic support E, which isother pole of the magnet. made as before stated, and sustains the armal,The armature is made of soft iron in the form ture in proximity to thepole of the magnet; of a short thickmass of iron of about the same butthe support is free to move as the armadiameter as the end of themagnet, and its ture is vibrated by the variations in the mag- ;'40length is about equal to its diameter. This netism. At the other side ofthe armaturearmature is attached to a thin piece of wood, support Ethere is a projection, F,that rests whalebone, vulcanite, brass, orequivalent maagainst the tympan G. This tympan will opterial. The endsof this armatureholder lie crate with the other parts, heretofore named,loosely in cavities made in a support attached when made of any suitablematerial; but I find 5 5 to the case of the magnet. On the opposite thata veneer of birds-eye maple is the best, side of the material supportingthe armature because it has no tone of its own when vibratis a shortspur,against which is held a tympan, ing, in consequence of the knottynature of the of wood or equivalent material, clamped wood. around itsedge between two rings attached to The edges of the tympan G are clampedbel5o the case of the magnet. The tympan is protween the rings H Iso asto be properly held, l l tected from coming into contact with the earand one of these rings is formed upon or conneeted with the handleportion of the instrul piece of iron,and an elastic support, to whichthe armature is attached, and a permanent meat, that is composed of acase surrounding the eIectro-magnct. In the casing below the ring Hseveral openings, 0, are made, so that the air is not confined uponeither side of the i tynipan. ()ne way of making such openings is toform the upper part of the case with lugs or arms, the spaces betweenwhich form the openings when the ringH is in position. The ring I may bepressed against the side 01' the head and the ear; but I prefer to useprojections L, that extend out from the ring I and limit the approach ofthe instrument to the ear.

The coil on the electro-magnet may extend from end to end thereof.

The holes in the tyinpan are shown in Figs. 3 and 4t.

I claim as my invcntion-' 1. The coinbinatioinina telephonic receiver,With an electrodnagnet, of an armature consist'ing of a short thickpiece ofiron, and a free elastic support for the same, substantially asspecified.

2. The co1nbination,in a telephonic receiver, i with an etectroniagnethaving a mass of soft iron attached to one ot'its poles, of an armaturein front of the other pole consisting of a short thick piece of iron,and a snpport,to which the same is attached, substantially as specified.

3. The combination of an ariinature capable of inductive action with apermanent magnet covered with a coil throughout its entire length,having a mass of soft iron in close contact with one end thereof,substantially as specified.

4. The combination,in atelephonio receiver,

of an armature consisting of a short thick magnet covered with a coil.throughout its entire length, and a mass of soft iron in close contactwith one end thereof, substantially as set forth The combination, "withan electromagnet and armature composed of a short thick piece ofiron, ofa tympa-n formed of a thin plate of wood, card-board, vuleanitemiea,brass, or equivalent material, substantially as set forth.

6. In a telephone receiver, the combination,

with a magnet and an armature, of an independent tylnpan having severalholes pierced irregularly thercthrongh outside of the portion thereoflying over the core of themagnet, as and for the purposes set forth.

7. The combination, in a telephonic receiver having a magnet, anarmature, and a tympan, of an open support for the armature and tympan,so that the air is not confined at either side of the tympan,substantially as specified.

S. The combination, with the magnet and armatnre,in a telephonicreceiver,ofa tylnpan of birds-eye maple, for the purposes set forth.

9. The combinationavith a permanentmagnot having H is around the end orends of said magne, of an armature consisting of a short thick piece ofiron attached, to a free elastic support, substantially as specified.

Signed by me this 9th day of January, A. D. 1.886.

W. C. BARNEY.

\Vitnesses:

G120. T. PINCKNEY, \VALLACE L. SnnnnLL.

